- Games & Hobbies, Ontario
- Garage Door Repair, Ontario
- Garage Doors & Door Operating Devices, Ontario
- Garage Doors & Gates, Ontario - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Ontario
- Garment & Linen Services, Ontario
- Gas Station, Ontario - Service & Filling Station
- General Business Consulting, Ontario
- General Business Services, Ontario
- General Consultants, Ontario
- General Freight Trucking, Ontario - Motor Freight
- General Merchandise Stores, Ontario
- General Surgeons, Ontario - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Ontario
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- Gift Baskets, Ontario
- Gifts By Type & Occasion, Ontario
- Gifts, Cards & Stationery Stores, Ontario
- Glass & Glazing Contractors, Ontario
- Glass Tinting & Coating, Ontario - Home - Car Window Tinting
- Golf Clubs Private, Ontario
- Golf Courses, Ontario
- Government, Ontario
- Graphic Design Services, Ontario - Graphic Designer
- Graphic Designer & Artist Services, Ontario
- Greek Restaurants, Ontario
- Grocery Stores & Supermarkets, Ontario
- Ground Transportation, Except Passenger, Ontario
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